moffatt



3 'Sheets-Skiset 1 J R MOFFATT DIFFERENTIAL FEEDING MECHANISII Original Filed'oct. 20. 1921i` Mgr-ch 5, 1929.

5 Sheets-Sheet 3 m IIIIIIIII J. R. MOF FATT DIFFERENTIAL FEEDING MECHANISM rginalT-led Oct. 20, 1921/ March 5,'y 1929.

'JAMES It.

MOETEN, on' oHIoAGio,`

ILLINoIs. ASSIGNOR To UNIoNfsrnoIAL MACHINE n `originarIvonne/e132, daieiifiiprii 2i,y 19,25, serial' reissue filed .December 3,1,`

The invention relates;to`,iiew*a.1id useful j nisms for' serving inachinesyand more partie-v ularlyA a differential' feeding mechanism which is `adapted to loehusedl iny a. compara.-

tively smallsvork supporting arm.

differentialv feeding ymechanism foi`- a Work yj...supportingarm Which is so `Constructed that iu the feed ydog may be raised andlowered 'with s litt-le or iioftiltingof the'feed dog from front to eargfoi viceversa.

Y l A vfurthfrobject ofthe invention is to pro-` t videladiff .rential feeding mechanism of the abovejcliaracter, livhereintlie auxiliary feed bar 1S "'iportedfby a `main feed bar,` so as tof Vmoveupland down therewith. and wherein main feed bar eidendssubstantially the 'j Aentire length ofthe Work supporting arm and Si `is pivetally and slidably ,supported.r at the innei'en'd thereof, lsothat the swinging move`- ments ofthe feed `bar to raise and vlower the feed dogs will cause saidfee'd dogs tofmove bodiliy veiiieally with littleor notiltingof' inentsojf y `ments `of bed doge from front to rear erviee'vers'a.' A furtljie object of *they invention is to proifferential Lfeeding mechanism ofthe wherein the. Workeng'agii'iginove-v tb e feedy dogsr and the feeding n i'ov-e-l the feedfdogs are secured from :two

above rlevers fiilerumed inthe vvorlfsupporting.arm.."

,'aiidyge fiame 'member carrying the Work supporting ending` to points Withina veiticalv armso `that le'coentric strapsin said vertical t frame' member may be connected to and opp-:prf

f erate said levers.

. j Thesek andk other obj ectsivillin part be ob-y gvious andA Will'inpafr't be hereinaftermore .Y therein g fullydisclosed.j`k f i yin the drawings,"which show b' ZWay of illustration one z embodimentI ofr t e invention:-`-. y

Figure 1 isaview partly in vertical section andA partly'in kside elevation, s liovvingha poi-,v `tionof al seivii'ig machine withy my improved eiential" feeding V mechanism j embodied feed fbar., the bracket which p ivotallyv An object of the invention is to provide l i `nini*iiREimniL Vannini*miiliioiiIiiIrISM.r

Ng; 508,931, inea` obtener 20,, 1921.*l

isis.y y seifiai No; 329,627.)y

l p slidablysupports the same andthe "pivot pin-1 iinproveijn'ents in differential feedingmecha-,g

the parts being separated show the structure; Figui-eff is a sectional vievvgon the line 4.-,-4of Figure l;

- Figure `5`is a sectional view on the line 5-5 of AFigure 6 of Figure l.;

Figure? is a forraising and lowering the` main feed bar to. more clearly` Applieation `for i isa sectionaly View on the line #UgfNlrEo fi Miri-.Nr :o Price., f l

perspective'view ofthe lever v i and the fulcriim pinv therefor,` `,said pin being separatedk from'the lever. toifsh'ovv the ecceir -tric construction for shiftingzthe position of 'the' fulcruin ofthe lever gift f F igiire Sis aperspective View of thelever for moving the. feed barfback and forth;

Figui'egis a'. perspectiveviewfof the auxv;

iliary feed barandthe levervvhicli moves the same'back and` forth.

I have shown the inventionas applied toa sewing machine vofthe type disclosedv inl the patent granted to Lansing Onderdonk December 18, 190.6, No. 839,017 j Said machine .hasa frame member extending horizontally and parallel ivith'the oVerhangingarm. The

machine hasjbeen. illustratedy only.in"'part in? the drawings and vrefereneeshould be had to said patentjfor a,betterunderstanding of the`v complete machine.

` In the present drawings thev horizontally extending member referredto is'indicated at 1 j land:y in said. horizontally extending member is an operating shaft whichI isdriven` v through ,suitablev connections from' the` main shaft. Projecting vertically from the horizontally projecting frame" member 1 is aver-- tica-l frame inember. The shaft 2 projects into the vertical-'fr,ameA member 3, and the endff thereof `is mounted in a bracket 4.v rFormed integral With the vertical frame` member,Bis` Y a Work supporting arm 5 Whicliis relativelj7 soy smallI an-djwhi'ch.projects laterally-from said l vertical framefmember to apoi'nt underneath `the needles. The needles areindioated at 6 vin the drawings 'and are carried .by al needley bai-7, Cooperatingfwith the needles 6 is a'` thready looper 8 which iscar-ried by a looper shaft 9. Said looper shaft 9 is mounted` inl suitable bearings inthe vv'orl `supporting-arm K5" andthe vertical frame niemlber,` softhat,` f the shaft may` beloscillated and also moved endivise forgiving the proper movements tov theloop'er. The loopei` supporting shaft j is oscillated by means of a link which is connected vto a radial arm 11 fixed tothe looper supporting shaft 9. This link 10 at its lower end is connected to one arm of a rock lever l2, which isI pivoted at 13 to the verti cal frame member 3. The other arm of the rock lever is pivoted toa link 14 which in turn is pivoted at 15 to an arm 16. The arm 16 is connected to an eccentric strap 17 which cooperates with an eccentric 18 on the-operat# Ying shaft 2. The looper supporting shaft 9 is moved endwise by means of a rock lever 19 which is connected to an eccentric strap 20 coopera-ting with an eccentric on the shaft 2.

This roc'k lever has a forked arm which is connected to a collar 21 free on the looper shaft and located between spaced collars 2222 attached to the looper shaft. As this rock lever 19 is oscillated the looper supporting shaft is moved endwise and as the link 14 and arm 16which form toggle links are moved toward and from a center line the looper is moved into and out of the needle thread loop 'and a dwell is given to the 0s.- cillation of the looper at the forward end of its stroke. This looper mechanism which has been referred to briefly forms nc part of the present invention but is shown, described and claimed in my copending application filed of even date herewith.

The material being stitched is held on the `work support by ra presser foot shown diagrammatically and inbreken lines at 23 in the drawings. The material isv fed off from the end of the arm as it is stitched and this i is brought' about by two feed dogs-the main feed dog` 24 and an auxiliary yfeed dog 25. The main feed dog 24 is carried by a main feed bar 26 whiclrextends lengthwise of the work supporting armv 5. Said feed bar 26 atits rear end carries a pivot pin 27 which .i has a reduced section 31 which is adapted to` li l) is located in the openings 28 in the feed bar. The bracket 29 carried by the work supporting frame is slotted at 30. The pivot pin 27 fit in this slot 30 and slide back and forth therein. A screw 32 passesdown through the bracket and closes the slot 30. Through this'construction the feed bar is capable of being moved endwise as the pin slides in the slot. its free end, said bar turning freely on the cylindrical ends of the pivot pin 27. The "main feed'dog is secured to the main feed bar by a screw 33, see Fig. 1'. The main feed bar is moved endwise for imparting feeding movements to the feed dog 24 by means of a lever 34. Said lever 34 is shown more in detail inFig. 8 and consists of a central sleeve 35, a rearwardly projecting arm 36 and a forwardly projecting arm 37. Said last named arm is provided with a curved slot 38. The

sleeve 35, as clearly shownin Fig. 6 of the drawings, is mounted on a pin 39 which is secured in the work supporting arm by means It may also be raised and lowered at which cooperates vwith an yeccentric on the main shaft.; Adjustably mounted in the slot 38 is a stud 42.V A link 43 is pivotally connected to this stud at its forward end, and this link is pivotally connected at its rear end to a stud 44 which in turn is Vmounted in the opening 45ain the rear end of the feed bar 26. I It will be seenthat as the operating shaft 2 rotates the eccentric strap 41 will rock the lever 34. lSaid lever Vas it rocks will give an endwise movement to the link 43 and this will impart an endwise movement to the feed bar 26. By adjusting the position of the stud 42 'the extent of movement imparted to the main feed bar may be varied.

The main feed bar is raised and lowered by means 'of a lever 45. Said lever is shown in perspective in Fig; 7 of the drawings'. The

pivot pin is mounted in bearing lugs 52-52 carried by the work supporting arm 5. A set screw 53 passes down through the top of one ofthe lugs and into the cut away portion 51 and is adapted to clamp the pivot pin against movement. By loosening this set screw a suitable ltool may be placed in the slot ofthe head 50, and the pivot pin turned so as to shift the position of the eccentric section 49 and this will raise or lower the fulcrum axis of the lever 45. The lever 45 at its forward end is connected to two vspaced links 54-54. These spaced links 54-54 are arranged on opposite sides of the forward end of the lever and are secured thereto by a pivot pin 55. The links at their upper end are secured to the feed bar by a pivot pin 56. The

ll l) lever 45 is connected at its rear end to an eccentric strapY 57 which cooperates with an eccentric on the shaft 2. As the shaft 2 rotatesfthe lever 45 will be oscillated and this willl raise and lower the main feed bar. By shifting the position of the eccentric portion 49 the fulcrum of the lever 45 may be raised and lowered and thus the working position 0f the said lever' varied and this will vary the position of the up and down movements of the feed bar, and the feed dog carried thereby.

The feed bar 26 is provided with a longitudinal slot 58 in the upper face thereof. Mounted in said slotis an auxiliary feed bar 59 to which the auxiliary feed dog is secured by means of a screw 60. Attached to the main feed bar is an angle plate 61. Said plate is secured to the feed bar by means of screws i 62,-,.-62-andl is so ypositioned [as toyoverlap the auxiliary feedfbar. ,595' and.; this plate confines i .i i the auxiliary' feedgbarto endwise movements only relative to rthe :main feed bar.` All up and down movements of the'main feedb'a'r l arevirnparted toythis auxiliary feed bar 59.,

The auxiliaryvfeed bar` 59 is moved` back I' and-'forth'by'means of a lever l63.` 4This lever y 63 isy shown in perspective `rview in Fig.A v9. Said lever 63fis yprovidedy with a projecting i is thus pivotally connected t the auxiliary feedbar.` Thelever at its lower end carries` each sideof thel. forward portion* of they lever 4:5. f Each arm `is forked at 6,8. The lever-,145

carrie'sfpins69-69, one at each side of `the v[lever andtheseforkedends of thelever 63 en.-

gagel over said-pins. (S9-.69; y"These `pins' act as ar fulcrum for ,the.lever-63",` Said lever isvr also provided with: a segmental slot 70. "A

y l link 71 ispivoted atits forwardend toy a studk 72,l adjustablyfmounted in the 'slot'"70.`f `The otherrend-iof this link 7l ispi-voted yat 73 to thefmainf-fee'd bar.

- Asthe main feed bar movesbackv and forth itfwil'lf oscillatethe lever 63, swinging the same :abouty thev ful'crumy pin f'69`. yThis fis".k a'ccomplished through the link connectionv 71.1 Inasmuch as the lever 63is1conne`cted to the- `auxiliary feedfbar itr will move the auxiliary feedbarendwise onthe main' feedbar provided the stud,` 7 2 is below a line passing .through `thepivot-bolt 66 andthe pivotjpin?L 73. In other. Words,` the distance from the stud 72 tothe fulcrum 69 is less than the dis# tance fromithe' pivot pin 66 to said lful'cruln 69". This*movement,oftheauxiliary feedbar onf themainr feed` bar can,.0f` course,ib e'in` creased by loweringvthe stud 7 2i` in the` slot 70. kThus it is'that a different movement can vbe imparted j to the? auxiliary feed dog fromy ythzat'vvhich'k isimparted to the main feed?" dog and this constitutes what is ywell knownv inthe art as a differential-feeding mechanism.- The auxiliary feed dogmoves the fabrijcitoI` agreater extentthan the niainy feed dog and* v ;t`hfus it is fulled inf infront ofthe needlesy as* ythe ystitcliin'ggoes on. H

f `From/the` abovedescription-itwill be aps "parent thatflhave provided avery simpledif#v n ferential feeding.'y mechanism'which consists"` ofveryI few parts andwherein bothk the maint` 'feedd'og andthe auxiliary feedy dog are operated from` the same' two"v eccentrics vand at thesarne time a diiferential feedinglmovement feeding mechanismA inthe work supporting framexnember.

y through-the Vsleeve and'isi threadedV into` the vauxiliary feed'barso that the leverr a mainy `feed. bar extending lengthwi `the work supporting arm and terminating adthe vertically `extending frame nie1nberj,` de? rvices,actuated bythe operating shaftfor os dog and extending rlengthwise of fthe supportingarm7 means for imparting a dif-y nected with the levery at apointintermedia and means for raising and lowering said feed Vf is given* to lthe different dogs` '.llhen,` again; it lwill be apparentth'at I havepacked'myfentire,

yrearwardly\intov thel vertical:framevr member wherethey may bereadily; connected `to ec.-

centric stra-ps and operated from. yrotating' ecc'entrics at,r the lower end;` `of;u the vertical V l v ItI is `obvious that minor changes in the de p tails of construction and the arrangement of the parts may bel (made without departingl from the spirit of the'pinvention` as set forth inthe appendedy claims. j j f f f Having thus describ d myiinvention. what I clai-nr as new and desire r to secure by Let-` ters Patentis-z- 1 i y y 1.y The feombination withv a vertically ex-` tending; frame -member, aworky supporting armat the upper endy thereof projecting lat erally therefrom, an operating shaft extendying into said frame member, amainfeeddog,

jacent said frame rnembenvmeansiforfmoving "saidfeed bar back and forth including-a lever pivoted to they work `supporting arm yalongside of saidniain feed bar' and rextending into o cillatingtsaid lever, av link conneetedjwith the f lever at a point.` intermediate the endsr of the main vfeed `bjar `and eXtending rearwardly andpivotally connected to the rea-r end ofthe mainfeedban an4 auxiliary feed dog,y an au'xy li-ary feed bar supporting said auxili ary feed work ferent'ial 'movement to lthe auxiliary feed i `bar,and means for `raising and lowering said' feed bars.

2. The combination of a vertically extendving framemember,` a work Supportingiarinat the@upper.end` thereof projecting laterally los therefrom;y an operating shaft 'extending into`= "said frame-memberyafmain feed: dog; a main Nfeedjbar extending' lengthwise of the work'v si1p]1,0rti1ig` yarm and! terminating adjacent said frame member, an auxiliary feed dog, an o auxiliary feed4 bar supported by said main feed barand carryingsaid` auxiliary'feed dog,`

Imeans for/moving thev feed bars back and forth including 1a lever pivoted in the work f supporting arm'alongside of the main feed 11F. bar andy extending into the` vertical frame member; devices actuated: by vthe operating shaft foroscillatingsaid/leverya link 'conate theendsofthe mai-nfeed bar and extending` rearwardly land :pivotally 'connected to the rear. endofthe main feedfb'ar,` devices for impartinga differentialmovement tothe l auxiliary feed dog from said main feed bar;

lao

shaft extending into said frame member,l a

main feed bar vextending'len'gthwise'of the work supporting arm' and terminating adjacentthe vertically extending frame member,

. a main feed dog carried by said main feed bar,

ber' and extending into said vertical member,

means for oscillating'said second lever Yfrom said shaft, a link having adjustable connection with the outer end of said lever and with the feed bar at the extreme inner end thereof for moving the feed bar backfand forth, and means for imparting a differential move# ment to the auxiliary feed dog from said main feed bar. Y f

4! The combination with a vertically extending framemember, a work supporting arm located at the upper' end thereof and projecting laterally therefrom, an operating shaft extending intov said frame member, a main feed bar extending lengthwise of said arm and terminating adjacent the vertically` extending frame member, means for pivotally supporting the inner end of said feed bar whereby the same may slide back and'forth, a lever located in said arm alongside ofthe feed bar and extending rearwardly into said vertical member, means for oscillating said lever from said shaft, a link having adjustable connection with the outer end .of .said lever and the inner end of said feed bar adjacent the pivot therefor, an auxiliary'feed dog carried by said main feed bar and movable up and down therewith, meansy 'for giving sad'aux-` iliary feed dog a differential movement from said main feed bar, a second'leverlocated in Y said armalongside of said main feed bar and projecting. rearwardly into said vertical inem ber, means for operating said lever from said shaft, and a pair' of links connected withthe outer end of said last-named lever and with the main feed bar for raising and lowering the same.

5. The combination with a vertically extending framc member, a. work supporting arm located at t-he upper end thereof, and projecting laterally therefrom, an operating shaft extending into said frame member, a main feed bar extending lengthwise of said arm and terminating adjacent the vertically extending frame member, means for pivotally supporting the inner i end of said feed bar whereby the same may slide back and forth, a lever located in said arm alongside ofthe feed bar and extending rearwardly into said vertical member, means for oscillating'said lever from said shaft, a link having adjustable connection with the outer end of said lever and the inner end ofsaid feed bar adjacent the pivot therefor, an auxiliary feed dogcarried by said mainfeed bar andfmovab'le up and down therewith, means for giving said 'auxiiliary feed dog a differential movement from said niaii'ifeed bar, a second lever located in said arm alongside ofsaid main feed bar and projectingrearwardly into said vvertical member, means foiaoperating said lever from said shaft, a pair of links connected with the outer end of said last-named lever and with the main' feed for raising and lowering the same, said means for moving the auxiliary ranged frame member, a work supporting arm located at the upper endV thereof and projecting laterally therefrom, an operatingshaft extending into said frame member, a main feed bar extending lengthwise of said arm, a main feed dog carried tliereby,an auxiliary feed bail supported by the main feed bar, an auxiliary feed dog carried by said auxiliary feed bar, means operated from said shaft for raising and lowering said feedbars, means operated from said shaft formoving said main feed bai back and forth, a lever pivotally connectcd at itsupper end to said auxiliary feed bar, ra `link having an adjustable connection with said'lever and connected toA said main feed bar, said lever at the lower end thereof beingforkcd, and a fulcrum pin extending through said forked end of the lever whereby said lever Amay rock on said fulcrum pin and impart feeding movements to the auxiliary `feed dog, and may move up and'down on the porting the inner end of said feed bar, said i pivot being located at the inner end of said ar1n,^an auxiliary feed dog, an auxiliary feed bar vcarried by said `main `feed bar, and mov-` able up and down therewith, means for rai-singand'lowering the feed bars, means for moving said main feed bar back and forth'inf cluding a lever pivoted in said work supporting arm and extending alongside of said main feed bar into said vertically extendingfframe member, a link pivoted'to said lever and to vthe feed bar at its inner end, devices actuatedby ythe operating shaft and connected to said leverfor oscillating the lever, a second lever ico ylll

l connected to Said vauxiliaryfft-bed bar, and lineans for connecting said secondlever to the main feed bar, Wherel'y movements of a different extent. may he imparted to said auxiliary feed barv from said mam feed bar.

. `8. The combination of a vertically extendingl frame member, work supporting arm projecting laterally therefrom, an operating shaft extending into Said framer memberha main feed dog, a feed bar carrying said main y feed dog and extendingl lengthwiee of said arm, means for pivotally and shdfably `eup-y porting the inner end of said feed bar, an auxiliary feeddog, Van auxiliary feed bar carried by the main feed bar and movable up and down therew1th,means for raising andlower- 1 n ing thef feed bars, meaneV forinov'ing Said 'main feed bar back and forth includingv a lever-pivotedin Said Workv Supporting arm and extending into said verticalframe member,

an eccentric on the operatingehaft, an eccentric strap, cooperating therewith and con! ynected to said leverv for osclllatingsaid lever,

said lever havinga slotted arm, a link having `any adjustable connection with Said' Slotted armfandasaid main feed barfformoving 'Said'main feed "bar: back andfforth, a Second leverpivoted tosaidauxiliary feed bar,

a lin-kI adjustably connected yto portion `and y y cillating the lever connected to Said aux said Isecond lever havingl a slotted portion, said Slotted to themainjfeed har for os- .f iliarylfeed bar, and means for pivotally supprojecting laterally therefrom, an operating y `:shaft extending into said frame member, a

porting said last named lever.-

9. The combination of a vertically extending frame member, a work supporting arm lever,

arm, means for pivotally and slidably supl porting the inner end of said feed bar, an auxiliary feed dog, an auxiliary feed bar carried the main feedloarand .movable up and 1 down therewith, means for raising and lowering the kfeedbare including a lever pivote'din Said Work supporting arm'and extendingv underneath theL main feed bar, a pair'of links connectingone'end of said lever With the main feed bar, said lever at its other end'y extending into said vertical frame member, an eccentric strap connectedfthereto, aneccentric on said operating'shaft with which `said strap cooperates, means for moving said main feed bar back and forth including a lever pivoted-A in said work supporting, arm and having one end thereof slotted, a `link adjustably connected to c said Slotted end and to the main feedbar for moving,l it back and forth, the other end of.

r,and an eccentricfon said operatingehaft for operating said last named eccentric strap, a third lever 1n saidA worlreupporting arm having slotted spaced arms' straddling the lever for raislng and-lowering the feedv bar, pins vcarried' byfsaid lever and engaging said forked arms andy forming a fulcrum foi-they y `Said lever being connected to the auxiliaryfeed'bar and'havingA a slotted portion,` and a link adjustably connected to said slotted portion at lone end and atit's other end to said auxiliary-feed bar; l

l In testimony whereof, I

JAMES R; `iviormrii affix my signature. 

